starch retrogradation

Starch retrogradation refers to undesirable changes in baked goods, primarily affecting texture. This process causes the interior of bread, known as the crumb, to become firm and lose elasticity, leading to a crumbly texture. While moisture loss can contribute to this, starch retrogradation can occur even without significant drying.1

This firming is a result of molecular changes within the starch. Sections of the long starch molecules aggregate, forming more rigid structures that are less soluble than when they were initially gelatinized. Heating can temporarily soften the crumb, but it doesn't fully restore the fresh texture.1

Starch retrogradation is a form of starch crystallization that can be slowed by adding certain compounds to dough, such as monoglycerides of fatty acids, which are starch-complexing agents. Certain starches, like those found in "waxy" cereals, are more resistant to gel formation and retrogradation, making them useful in products like salad dressings and pie fillings.12